ENGR00179437-1: u-boot: iomux: NO_PAD_I/NO_PAD_MUX not set corretly

NO_PAD_I/NO_PAD_MUX not defined correctly, which will cause build error.
And According to iomux-v3.h, the NO_PAD_I/NO_PAD_MUX should be 0 for the
pins which does not have PAD/MUX config.

Signed-off-by: Jason Liu <r64343@freescale.com>